Catalogue of Arcade Emulation Software - the Absolute Reference

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Gradius (PlayChoice-10)

Gradius (c) 1986 Konami.


Nintendo PlayChoice-10 hardware

Game ID : GR

Main CPU : Z80 (@ 4 Mhz), N2A03 (@ 1.789772 Mhz)

Sound Chips : N2A03 (@ 1.789772 Mhz), DAC (@ 1.789772 Mhz)

Screen orientation : Horizontal

Video resolution : 256 x 240 pixels

Screen refresh : 60.00 Hz

Palette colors : 320

Players : 2

Control : 8-way joystick

Buttons : 2


Kazuhisa Hashimoto, who programmed this Nintendo Famicom port, found the original arcade game too hard, so he inserted the so-called Konami code (see Tips & Tricks section).


* Continue : at the Game Over screen press Down, Up, B, A, B, A, B, A, Start. Note : This can only be used once per game.

* Classic Konami code : press Start during the game, then press Up(x2), Down(x2), Left, Right, Left, Right, B, A, Start. This code equips you with two Missiles, two options and a force field barrier.

* Secret message : during the title screen hold B+A, then reset the machine and return in the game (always with B+A) to get the following message : KONAMI ONE, GRADIUS ONE.

* Level skip : destroy the ship that appears at the end of each level within five seconds to skip the next level.


Programmed by : Kazuhisa Hashimoto

Music by : Miki Higashino